本文選題：堆積體 + 抗滑樁加固�。� 參考：《華北水利水電大學(xué)》2017年碩士論文

【摘要】：滑坡是一種斜坡破壞的地質(zhì)災(zāi)害類型,在各種地質(zhì)災(zāi)害中分布最廣、危害最嚴重�；碌闹卫韺ΡＵ先嗣袢罕姷纳敭a(chǎn)安全和工程建設(shè)的順利進行有著重要的意義�？够瑯蹲鳛榛轮卫淼囊环N主要工程措施,以其諸多優(yōu)點得到了非常廣泛的應(yīng)用。然而,由于治理后監(jiān)測數(shù)據(jù)的匱乏,目前針對抗滑樁加固效果評價的研究較少。本文以白鶴灘水電站下紅巖堆積體為研究對象,針對采用抗滑樁加固的堆積體治理效果評價進行了一系列的研究工作,取得的主要研究成果分述如下:(1)在充分掌握下紅巖堆積體勘察資料并參閱前人研究成果的基礎(chǔ)上,明確了該堆積體滑坡的滑動范圍、滑動面的位置及其空間展布、滑帶土的性質(zhì)等,并在此基礎(chǔ)上對該堆積體的變形破壞模式、外部影響因素進行分析。得出了該堆積體的變形機制是:前緣大寨溝下切具備臨空條件,其組成物質(zhì)在強降雨作用及人類活動的影響下,沿軟弱層帶產(chǎn)生蠕動或滑動。(2)采用MIDAS/GTS有限元軟件對抗滑樁施工前的堆積體建立三維有限元數(shù)值模型進行數(shù)值模擬分析,以確定堆積體的應(yīng)力狀態(tài)及變形特征。結(jié)果表明:堆積體在滑帶附近區(qū)域存在較大范圍連貫的剪切破壞區(qū),堆積體極易沿基覆界面發(fā)生牽引式變形。將堆積體的數(shù)值模擬成果與工程地質(zhì)分析結(jié)果對比可知,其分析成果是基本一致的,這表明下紅巖堆積體數(shù)值計算模型的建立及參數(shù)取值是合理的。(3)對抗滑樁工程施工完成前后堆積體的表面位移及內(nèi)部位移監(jiān)測成果進行了總結(jié)分析,得出了堆積體的變形規(guī)律及其外部影響因素。對抗滑樁工程施工完成后樁身的應(yīng)力應(yīng)變監(jiān)測成果進行了總結(jié)分析,結(jié)果表明抗滑樁工程施工完成后,各樁受力狀況良好,說明抗滑樁結(jié)構(gòu)設(shè)計及分布是合理的。(4)運用MIDAS/GTS數(shù)值模擬軟件對堆積體治理后的穩(wěn)定性建立三維有限元數(shù)值模型進行了模擬分析。結(jié)果顯示:采取抗滑樁工程治理以后,堆積體穩(wěn)定性大大提高,整體穩(wěn)定性良好。(5)通過對不同工況條件下堆積體穩(wěn)定性的數(shù)值模擬結(jié)果與監(jiān)測數(shù)據(jù)分析結(jié)果的綜合分析,可判斷該堆積體采取抗滑樁加固效果顯著,抗滑樁工程完工后,堆積體趨于穩(wěn)定狀態(tài)。
[Abstract]:Landslide is a kind of geological hazard of slope damage, which is the most widely distributed and the most serious hazard in all kinds of geological disasters. The treatment of landslide is of great significance to ensure the safety of people's life and property and the smooth progress of engineering construction. As one of the main engineering measures for landslide control, anti-slide pile has been widely used for its many advantages. However, due to the lack of monitoring data after treatment, there is little research on the evaluation of anti-slide pile reinforcement effect. In this paper, a series of research work has been done to evaluate the effect of anti-slide pile reinforcement on the red rock accumulation in Baihetan Hydropower Station. The main research results obtained are as follows: (1) on the basis of fully mastering the investigation data of the red rock deposit and referring to the previous research results, the sliding range, the position of the sliding surface and the spatial distribution of the landslide are determined. On the basis of the properties of the sliding zone soil, the deformation and failure mode of the deposit and the external influence factors are analyzed. It is concluded that the deformation mechanism of the deposit is that the front edge of Dazhaigou has the condition of facing the air, and its composition is affected by heavy rainfall and human activities. In order to determine the stress state and deformation characteristics of the pile, a three-dimensional finite element numerical model was established by using the MIDAS/GTS finite element software to resist the pile before construction. The results show that there is a large range of coherent shear failure zone in the area near the slip zone, and it is easy to produce traction deformation along the interface of the foundation. By comparing the results of numerical simulation with the results of engineering geological analysis, we can see that the results of the analysis are basically the same. This indicates that the establishment of numerical calculation model and parameter selection of the lower red rock accumulation body is reasonable. The monitoring results of surface displacement and internal displacement of the accumulated body before and after the construction of the anti-slide pile are summarized and analyzed. The deformation law and its external influencing factors are obtained. The stress and strain monitoring results of the pile body after the construction of the anti-slide pile project are summarized and analyzed. The results show that after the construction of the anti-slide pile project, the stress condition of each pile is good. It is shown that the design and distribution of anti-slide pile structure is reasonable. The MIDAS/GTS numerical simulation software is used to simulate and analyze the stability of the pile after treatment with three-dimensional finite element numerical model. The results show that after adopting anti-slide pile engineering treatment, the stability of the accumulation body is greatly improved, and the overall stability is good. 5) through the comprehensive analysis of the numerical simulation results and the monitoring data analysis results of the accumulation body stability under different working conditions, It can be concluded that the effect of anti-slide pile reinforcement is remarkable and the pile tends to be stable after the completion of the anti-slide pile project.
【學(xué)位授予單位】：華北水利水電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TV223

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